Improvement in door-bells



Improvement in Bob rrrrrrr I 0.13 3 2 6 9 P a t e n t e d N o v I 9 1 87 2.

WITNESSES. T NNNNNN 05..

TJNITED SrArns AMOS L. SWAN, OF CHERRY VALLEY, NEW YORK.

IMPROVEMENT IN DOOR BELLS.

Specification forming part of Letters Patent No. 133,269, dated November19, 1872.

' To all whom it may concern:

Beit known that I, Amos L. SWAN, of Cherry Valley, in the county ofOtsego and State of New York, have invented a new and valuableImprovement in Door-Bell Alarms; and I do hereby declare that .thefollowing is a full, clear,

and. exact description of the construction and operation of the same,reference being had to the annexed drawing making a part of thisspecification, and to the letters and figures of reference markedthereon.

Figure 1 of the drawing is a representation of a partial sectional viewof my invention.

My invention has relation to door-gongs; and consists in thehereinafter-described construction and novel arrangement of thebellpull, whereby the parts appertaining thereto are prevented frombeing injured by careless use, and in the construction and novel arrangement of the slotted swinging plate; the

notched tumbler and the swinging arm and stud constituting the strikingmechanism, whereby two strokes are made wheneverthe bell-handle is drawnoutand let go.

Referring to the drawing, A designates the door-jamb; B, the bell-handleor knob; O, the shank thereof D, a rod attached to said shank by meansof a shackle, d, which allows the knob and shank to turn freely andwithout danger of injury. D is a platesecurcd to the jamb; D aleverpivoted to said plate; D', a slotted flange formed on the end of theplate .D to let the lever D pass through; D, a

wire connecting said lever to the striking mechanism. E E represent apair of toggles pivoted, respectively, to the plate DP and to the leverD The pin which connects said toggle together holds a block, F, to whichis secured the rod D, as shown. When the bellhandle is pulled the togglepresses the lever.

D down and causes the wire 'D to be drawn down until the gong sounds analarm. The

striking mechanismv allows the handle to be plate is moved in onedirection by means of said wire and the bell-pull and in the otherdirection by means of the spring. This-plate has a loop, J, which worksin notches in the cam h, and has a curved slot, K, which allows it topass the cam-pivot. When the bellhandle is pulled the plate I is drawndown and the cam so turned, by the loop J acting against the outer lugt, as to communicate motion through the link H to the hammer and toraise the same. As soon as the cam has made a quarter revolution thespring L, which encircles the post m and acts upon the hammer and linkH, causes the cam to complete the half revolution, and thereby enablesthe hammer to strike the bell once. When the bell-handle is let go theplate I rises, and the loop J, acting against the lug 'i of the cam,turns the cam backa quarter revolution, again raising the hammer untilthe loop passes the cam pivot, when the spring again acts and producesanother stroke. The loop J is pivoted to the plate I, and has a fingeron its end to catch the ears of the cam. This finger enters a notch atone side ot the slot K, and is therein allowed the requiredplay to movein a line with the cam. The slot K is designed to be of considerablelength, so that the plate I may turn 011 its pivot, no matter how farout the bell handle is pulled, without straining any of the otherdevices. The block F is of a peculiar construction, having twocommunicating sockets bored through it, one to receive the end of therod 1) and the other, which is inclined, to receive a. screw, f, bymeans of which said rod is tightened.

The rod is adjustable, and by loosening the screw may be lengthened orshortened, as desired, to regulate the stroke or movement of thebell-handle.

What I claim as my invention, and desire.to secure by Letters Patent, isV The pivoted tumbler h having the legs it, in combination with theswinging plate I having the slot K and pivoted arm J, the link H, springL, hammer F, and gong F, substan tially as specified.

In testimony that I claim the above I have I hereunto subscribed my namein the presence of two witnesses.

AMOS L. SWAN. Witnesses:

Guns. McLEAN, JOHN SHARP.

